nights when she was working late, refused to walk to her car alone. she finally found a colleague who agreed to drive her to her car. >> we looped around to the far back row, where we were parked. and so when the headlights came around the corner, we saw her on the pavement and stopped. >> in the headlights, they saw a woman lying on the ground. >> i recognized the dress right away. and her dressed was pulled up, and her purse was down on the ground. and i thought, "well, this doesn't make sense." >> it didn't make sense because the dress belonged to one of her students with whom she'd spent most of the evening. they'd parted ways only half an hour earlier. >> when you see a body like that, it really doesn't look real. it almost looked like a ragdoll of sorts. and i hate to use that term